I'd say Whiskey's biggest difference from Beer would be the background presentation. Beer barely alters anything from the background while Whiskey makes the background pitch-black and makes me focus more on the sound itself. Whiskey works great with almost all kinds and types of IEMs.

It works fine with DD, BA, and many others and my best recommendation would be to match these with DD IEMs. BA IEMs match well just as good, though I personally think these to show the sweetest matching when paired with DD IEMs. Whiskey can handle bass-heavy IEMs too as it doesn't sacrifice the upper-frequency sparkles and details.

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